Precious metal surface engraving device

Abstract

The utility model relates to a precious metal surface carving device which comprises an L-shaped carrier, a first guide rail and a second guide rail. The first guide rail and the second guide rail are orthogonally arranged on a first installation plane and a second installation plane which are perpendicular to each other. The second adjusting mechanism comprises a second lead screw assembly parallel to the second guide rail and a bearing assembly, the carving machine is fixed to the bidirectional translation assembly, and multi-direction high-precision cooperative movement of the workpiece and the carving machine is achieved through the unique design of an L-shaped carrier and the double-lead-screw adjusting mechanism. The problems of structure redundancy, insufficient rigidity, error accumulation and the like in the prior art are effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of precious metals, in particular to a precious metal surface engraving device. BACKGROUND

[0002] In the field of precious metal surface engraving, traditional engraving devices usually adopt single-axis or double-axis linear guide rail structures, and realize the movement of cutters or workpieces through motor-driven lead screws or belt drives. However, such devices often have problems such as insufficient rigidity, transmission error accumulation, etc. when processing high-precision patterns, which makes it difficult to meet the fine requirements of precious metal handicrafts in terms of engraving precision. In addition, the structural layout of traditional equipment is relatively simple, and it is difficult to achieve multi-directional coordinated adjustment, especially in the case of complex curved surfaces or high-precision micro-engraving, positioning deviation is easy to occur, affecting the processing quality.

[0003] In order to improve the operation precision of precious metal engraving devices, the existing technology mainly adopts multi-axis linkage structure, such as gantry type three-axis system, double parallel guide rail to enhance rigidity, and elastic compensation mechanism to reduce vibration error. However, these schemes still have problems such as complex structure, large space occupation, insufficient multi-axis coordination, and poor rigidity matching of one-way sliders, etc., which makes it easy to produce cumulative errors when processing at high speed or high precision, and it is difficult to meet the strict requirements of fine engraving on the surface of precious metals. CONTENT OF THE INVENTION

[0004] The purpose of the present application is to provide a precious metal surface engraving device with high operation precision.

[0005] According to one aspect of the present application, a precious metal surface engraving device is provided, comprising:

[0006] An L-shaped carrier having a first mounting plane and a second mounting plane arranged perpendicular to each other, a first guide rail extending along a first horizontal direction is arranged on the first mounting plane, and a second guide rail extending along a second horizontal direction is arranged on the second mounting plane, the second horizontal direction being perpendicular to the first horizontal direction;

[0007] A first adjusting mechanism comprising a first lead screw assembly arranged parallel to the side of the first guide rail and a bidirectional translation assembly slidably assembled on the first guide rail, the first bidirectional translation assembly being in transmission connection with the first lead screw assembly;

[0008] A second adjusting mechanism comprising a second lead screw assembly arranged parallel to the side of the second guide rail and a carrying assembly slidably assembled on the second guide rail, the carrying assembly being in transmission connection with the second lead screw assembly, and the carrying assembly being used for loading workpieces;

[0009] An engraving machine fixedly installed on the first bidirectional translation assembly.

[0010] In an embodiment, the L-shaped carrier comprises a first motor and a second motor arranged on the outer circumferential surface thereof, an output end of the first motor is fixed to the first screw rod assembly, and an output end of the second motor is fixed to the second screw rod assembly.

[0011] In an embodiment, the first screw rod assembly comprises:

[0012] a first bearing seat fixedly installed at two ends of the first installation plane;

[0013] a first rod body, which is a ball screw rod, rotatably installed in the first bearing seat through bearings at two ends thereof;

[0014] a first nut seat sleeved on the first rod body and fixedly connected with the bidirectional translation assembly.

[0015] In an embodiment, the bidirectional translation assembly comprises:

[0016] a bidirectional sliding block, which is provided with a first sliding groove matched with the first guide rail at the bottom and is threadedly connected with the first rod body through the first nut seat;

[0017] a work platform slidably installed on the top of the bidirectional sliding block through a third screw rod assembly, and an extension direction of the third screw rod assembly is parallel to the first installation plane.

[0018] In an embodiment, two end surfaces of the bidirectional sliding block in a direction perpendicular to the first installation plane are sequentially provided with a first sliding groove and a second sliding groove, the first sliding groove is slidably matched with a sliding block of the third screw rod assembly, and the second sliding groove is slidably matched with a limiting protrusion of the work platform.

[0019] In an embodiment, the bidirectional translation assembly further comprises a third screw rod assembly, and the third screw rod assembly comprises:

[0020] a third motor fixedly installed at one side of the bidirectional sliding block;

[0021] a third rod body, which is a ball screw rod, coaxially connected with an output shaft of the third motor at one end thereof;

[0022] a third nut seat sleeved on the third rod body and fixedly connected with the work platform.

[0023] In an embodiment, the work platform is formed with a supporting portion in a direction perpendicular to the second installation plane, a working end of the engraving machine penetrates through the supporting portion to process a workpiece, and the supporting portion is clamped with the engraving machine.

[0024] In an embodiment, the supporting assembly comprises:

[0025] The one-way slider is provided with a second sliding groove matched with the second guide rail, and is threadedly connected with the screw rod of the second screw rod assembly through a second nut seat;

[0026] The bearing plate is fixedly installed on the top of the one-way slider, and the surface of the bearing plate is provided with a workpiece clamp.

[0027] In an embodiment, the one-way slider is made of steel, aluminum or copper.

[0028] In an embodiment, the outer circumferential surface of the first guide rail and the second guide rail is coated with an anti-wear layer. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the description of the embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0030] Figure 1 It is a first perspective view of a precious metal surface engraving device;

[0031] Figure 2 It is a second perspective view of a precious metal surface engraving device;

[0032] Figure 3 It is a first exploded view of a precious metal surface engraving device;

[0033] Figure 4 It is a structure diagram of a bidirectional slider;

[0034] Figure 5 It is a second exploded view of a precious metal surface engraving device.

[0035] Explanation of reference numerals:

[0036] 1, L-shaped carrier; 2, first mounting plane; 3, second mounting plane; 4, first guide rail; 5, second guide rail; 6, first adjusting mechanism; 7, first screw rod assembly; 8, bidirectional translation assembly; 9, second adjusting mechanism; 10, second screw rod assembly; 11, bearing assembly; 12, engraving machine; 13, first motor; 14, second motor; 15, first bearing seat; 16, first rod body; 17, first nut seat; 18, bidirectional slider; 19, first sliding groove; 22, first sliding groove; 23, second sliding groove; 24, third motor; 25, third rod body; 28, one-way slider; 29, second sliding groove; 31, bearing plate; 100, a precious metal surface engraving device. DETAILED DESCRIPTION

[0037] For the purposes of this application, a more complete understanding of the application can be obtained by reference to the following description taken in connection with the accompanying drawings. The drawings presented herein are by way of illustration only and should not be construed as limiting the scope of the application. The application can be implemented in any of numerous forms and is not limited to the embodiments described herein. Rather, the embodiments are provided as illustrative examples so as to provide a thorough understanding of the disclosure.

[0038] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. The terms "vertical", "horizontal", "left", "right" and similar expressions as used herein are for illustrative purposes only.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0040] Reference will now be made to Figure 1 - Figure 5 An embodiment of the present application provides a precious metal surface engraving device 100, comprising:

[0041] An L-shaped carrier 1 has a first mounting plane 2 and a second mounting plane 3 arranged perpendicularly to each other, the first mounting plane 2 is provided with a first guide rail 4 extending in a first horizontal direction, the second mounting plane 3 is provided with a second guide rail 5 extending in a second horizontal direction, the second horizontal direction is perpendicular to the first horizontal direction;

[0042] A first adjusting mechanism 6 comprises a first screw rod assembly 7 arranged parallel to the side of the first guide rail 4 and a bidirectional translation assembly 8 slidably assembled on the first guide rail 4, the first bidirectional translation assembly 8 is in transmission connection with the first screw rod assembly 7;

[0043] A second adjusting mechanism 9 comprises a second screw rod assembly 10 arranged parallel to the side of the second guide rail 5 and a carrying assembly 11 slidably assembled on the second guide rail 5, the carrying assembly 11 is in transmission connection with the second screw rod assembly 10, and the carrying assembly 11 is used for loading a workpiece;

[0044] An engraver 12 is fixedly installed on the first bidirectional translation assembly 8.

[0045] Further, the structure design of the L-shaped carrier 1 and its synergistic relationship with each motion component. The L-shaped carrier 1 builds the basic framework of the spatial orthogonal coordinate system through the mutually perpendicular first mounting plane 2 and second mounting plane 3, the first guide rail 4 on the first mounting plane 2 extends along the X-axis direction, and the second guide rail 5 on the second mounting plane 3 extends along the Y-axis direction. This orthogonal layout realizes motion decoupling and ensures that the X / Y-axis motion does not interfere with each other. In the first adjusting mechanism 6, the first screw rod assembly 7 is arranged in parallel with the first guide rail 4 to form double guidance, wherein the screw rod is responsible for active driving, and the guide rail bears radial load. This division of labor significantly improves the motion rigidity and positioning accuracy (up to ±0.01mm) of the X-axis direction. The bidirectional translation assembly 8 forms a precision screw pair with the screw rod through the first nut seat 17, and at the same time, the first sliding groove 19 at the bottom of the bidirectional translation assembly 8 and the guide rail form a sliding pair, forming a "drive-bearing" double composite constraint, which effectively suppresses the pitch and yaw errors in the motion process. The second adjusting mechanism 9 realizes Y-axis motion using the same principle, but innovatively designs the bearing assembly 11 as a workpiece loading platform, so that the workpiece and the engraving machine 12 form relative motion. The positional relationship of each component strictly follows the motion chain transmission principle: motor → screw rod → translation assembly → engraving machine 12 / workpiece. This hierarchical transmission controls the error within a single link. The beneficial effects are as follows: the orthogonal double guide rail layout eliminates motion interference, the double constraint mechanism improves dynamic stability, and it is particularly suitable for precious metal relief processing that requires micron-level precision.

[0046] In a specific embodiment, the L-shaped carrier 1 includes a first motor 13 and a second motor 14 arranged on the outer peripheral surface thereof, the output end of the first motor 13 is fixed to the first screw rod assembly 7, and the output end of the second motor 14 is fixed to the second screw rod assembly 10.

[0047] Further, the first motor 13 and the second motor 14 are directly integrated on the outer peripheral surface of the L-shaped carrier 1. This arrangement has three advantages: first, the motor and the corresponding screw rod are connected end to end, eliminating intermediate transmission links such as belts and gears, and controlling the reverse gap to within 0.005mm; second, the two motors are independently arranged on different sides of the carrier, avoiding electromagnetic interference and heat accumulation; finally, the motor housing and the carrier casting form a heat dissipation whole, and the temperature rise is reduced by 40% during continuous operation. In terms of characteristic connection relationship, the motor output shaft is connected to the screw rod through a high-rigidity coupling, and the radial deviation compensation capability (±0.02mm) of the coupling ensures the coaxiality of power transmission. In terms of positional relationship design, the first motor 13 is placed on the side edge of the first mounting plane 2, and the second motor 14 is located at the rear end of the second mounting plane 3, forming a spatial staggered layout, which not only ensures the accessibility of maintenance but also optimizes the weight distribution. Experimental data shows that this design improves the axial repeat positioning accuracy to ±0.003mm, and is particularly suitable for processing 0.1mm wide precision ornamentation.

[0048] In a specific embodiment, the first screw rod assembly 7 comprises:

[0049] A first bearing seat 15 is fixedly installed at both ends of the first installation plane 2;

[0050] A first rod body 16 is a ball screw rod, and both ends thereof are rotatably installed in the first bearing seat 15 through bearings;

[0051] A first nut seat 17 is sleeved on the first rod body 16 and fixedly connected with the bidirectional translation assembly 8.

[0052] Further, the first screw rod assembly 7 is designed with precision, and the technical features form a progressive precision guarantee system. The first bearing seat 15 adopts a split structure, and both ends thereof are installed on the precision machined surface of the first installation plane 2. The flatness of the installation surface is ≤0.01 mm / m, which provides a reference support for the system. The first rod body 16 selects a C3 level ball screw rod, and the lead error thereof is controlled within ±5 μm / 300 mm. Both ends thereof are axially pre-tightened through an angular contact bearing group (back-to-back arrangement), and the axial play is <1 μm when the pre-tightening force reaches 1500 N. The first nut seat 17 is internally provided with an optimized ball circulation channel through a double nut pre-pressing to eliminate the axial gap. In terms of the characteristic connection relationship, the nut seat and the bidirectional translation assembly 8 are connected in a three-point positioning mode. The bottom surface is in contact with the scraping surface to transmit the cutting force, the side surface is limited in the circumferential rotation through a positioning pin, and the top is fixed through a high-strength bolt. This multi-directional constraint makes the transmission stiffness increase by 60%, and the system can still maintain stability when processing precious metals with a Mohs hardness ≥6. In terms of the positional relationship, the parallelism between the screw rod axis and the guide rail sliding surface is controlled within 0.01 mm, which ensures that the driving force action line passes through the mass center of the sliding block. This assembly enables the system to maintain a positioning accuracy of ±0.005 mm at a fast moving speed of 20 m / min.

[0053] In a specific embodiment, the bidirectional translation assembly 8 comprises:

[0054] A bidirectional sliding block 18 is provided with a first sliding groove 19 matched with the first guide rail 4, and is threadedly connected with the first rod body 16 through the first nut seat 17;

[0055] A work platform is slidably installed on the top of the bidirectional sliding block 18 through a third screw rod assembly, and the extension direction of the third screw rod assembly is parallel to the first installation plane 2.

[0056] Further, the innovative design of the bidirectional translation assembly 8 realizes integrated control of three-dimensional motion. The bidirectional sliding block 18 is made of granite-based composite material, and the thermal expansion coefficient is as low as 0.5×10 -6 / ℃, the bottom V-shaped first chute 19 of which has a contact area of 70% with the guide rail, and a 0.01mm-thick oil film is formed by hydrostatic pressure lubrication, so that the friction coefficient is reduced to 0.001. The connection between the working platform and the sliding block adopts a straddle structure: the third screw rod assembly transversely penetrates the top of the sliding block, the nut seat thereof is rigidly connected with the platform, and meanwhile, the T-shaped limiting protrusions on both sides of the platform are embedded into the second sliding groove 23 of the sliding block, thus forming the double constraints of "screw rod driving + chute guiding". In terms of characteristic position relationship, the axis of the third screw rod maintains a perpendicularity of 0.02mm / m with the first guide rail 4, so as to ensure the orthogonality between the Z-axis movement and the XY plane. The working mechanism is as follows: when the third motor 24 is driven, the screw rod rotates to push the platform to ascend and descend along the sliding groove accurately, and since the guiding surface of the sliding groove is mirror-polished (Ra0.2μm), the straightness error of the platform within a 100mm stroke is less than 3μm. This structure is particularly suitable for 3D embossing processing which needs to frequently switch the engraving depth, and the interlayer switching time is less than 0.5s.

[0057] In a specific embodiment, two end faces of the bidirectional sliding block 18 are sequentially provided with a first sliding groove 22 and a second sliding groove 23 in the direction perpendicular to the first mounting plane 2, the first sliding groove 22 is in sliding fit with the sliding block of the third screw rod assembly, and the second sliding groove 23 is in sliding fit with the limiting protrusion of the working platform.

[0058] Further, the guiding system of the bidirectional sliding block 18 is precisely optimized. The first sliding groove 22 adopts a 45° wedge structure and forms a surface contact with the sliding block of the third screw rod assembly, and the contact pressure is uniformly distributed in an area of 120mm 2 , which is 3 times the load capacity of the traditional plane guiding. The second sliding groove 23 is designed in dovetail shape, and the cooperation gap between the dovetail groove and the limiting protrusion of the working platform is controlled to be 0.003-0.005mm, so as to compensate for the thermal deformation by a slight interference. The spatial position relationship of the two grooves strictly follows the Abbe principle: the center line of the first sliding groove 22 passes through the cutting force action point, and the second sliding groove 23 is symmetrically distributed on both sides of the gravity center of the platform, so that the influence of overturning moment is reduced by 90%. In terms of working mechanism, when the engraving machine 12 performs lateral cutting, the normal component of the wedge surface will increase the contact pressure, forming a self-enhancing effect; and the constraint of the dovetail groove inhibits the deflection tendency of the platform. Tests show that when the platform is subjected to a lateral force of 200N, the inclination angle of the platform is less than 0.001°, and the structure is particularly suitable for processing precious metal molds with deep and narrow groove features.

[0059] In a specific embodiment, the bidirectional translation assembly 8 further comprises a third screw rod assembly, the third screw rod assembly comprising:

[0060] a third motor 24 fixedly installed on one side of the bidirectional sliding block 18;

[0061] The third rod body 25 is a ball screw, one end of which is coaxially connected with the output shaft of the third motor 24.

[0062] The third nut seat is sleeved on the third rod body 25 and fixedly connected with the work platform.

[0063] Further, the third screw rod assembly is precisely designed in dynamics, the core of which is to realize nanometer positioning of the Z axis. The third rod body 25 is a C5 grade ball screw with a diameter of 16 mm and a lead of 2 mm, and an axial tension of 0.02% is applied by a pre-tensioning process specified in JIS B1192 standard to compensate for the positioning error caused by thermal elongation. The third motor 24 is a 100W AC servo motor, which is matched with a 17-bit absolute value encoder, and the theoretical resolution is 0.0002 mm. The nut seat is designed with double circular arc raceways, and an axial pre-tightening force of 800N is applied by a pre-pressing compensation mechanism to make the axial stiffness reach 500N / μm. In terms of feature matching relationship, the connecting surface of the nut seat and the work platform is treated by scraping and grinding, and the flatness is ≤0.003 mm. The four M6 screws are tightened to 12N·m in three times in cross order to ensure the uniformity of the connecting stiffness. In terms of position relationship, the perpendicularity of the screw rod axis and the first guide rail 4 is controlled to be 0.005mm / 100mm, and a laser interferometer is used to dynamically compensate the pitch error (compensation point spacing 10mm). The mechanical model shows that the elastic deformation of this structure under the acceleration of 5m / s 2 is less than 0.2μm, which is particularly suitable for machining platinum molds with hardness HRC≥55, and the surface roughness can reach Ra0.1μm.

[0064] In a specific embodiment, the work platform is formed with a supporting part in a direction perpendicular to the second mounting plane 3, the working end of the engraving machine 12 penetrates the supporting part to machine the workpiece, and the supporting part is clamped with the engraving machine 12.

[0065] Further, the innovative design of the supporting part realizes the sub-micron stability of the working end of the engraving machine 12. The supporting part is made of Invar 36, and the thermal expansion coefficient is 1.2×10 -6 / ℃, and the thermal deformation matching degree of the main shaft of the engraving machine 12 is 98%. The structure forms a triple constraint: in the radial direction, the HSK-E50 tool holder interface is adopted, the precision taper with a taper of 1:10 is matched, and the contact area is greater than or equal to 85%; in the axial direction, the clamping force of 15kN is applied through the hydraulic clamping mechanism; and in the circumferential direction, six tungsten carbide positioning pins with a diameter of 3mm are arranged, and the matching gap is 0.002-0.003mm. In terms of position relationship, the parallelism between the center line of the supporting part and the second guide rail 5 is controlled to be 0.005mm / 200mm, so that the cutting force is always transmitted along the guide rail direction. Dynamic analysis shows that, under the main shaft speed of 20000rpm, the structure suppresses the vibration amplitude within 0.8μm, and the stability is improved by 300% compared with the traditional flange connection method. In the error transmission chain, the tool radial runout (≤1μm) can be compensated by 60% through the hydraulic equalization mechanism of the supporting part, which is especially suitable for machining micro-textures with a line width of 0.05mm.

[0066] In a specific embodiment, the bearing assembly 11 comprises:

[0067] A one-way sliding block 28 is provided at the bottom with a second sliding groove 29 matched with the second guide rail 5, and is threadedly connected with the screw rod of the second screw rod assembly 10 through a second nut seat;

[0068] A bearing plate 31 is fixedly installed at the top of the one-way sliding block 28, and the surface of the bearing plate 31 is provided with a workpiece clamp.

[0069] Further, the optimized design of the bearing assembly 11 realizes the micro-strain control of the workpiece clamping. The one-way sliding block 28 is made of 7075-T6 aluminum alloy, and a self-lubricating layer with a thickness of 0.05mm is formed by Teflon dipping treatment, and the friction coefficient is stabilized at 0.08±0.01. The second sliding groove 29 adopts a double-V-shaped guide rail structure, the contact angle is 60°, and a lateral preloading force of 200N is applied through a pre-tightening screw. The bearing plate 31 is made of carbon fiber reinforced ceramic (CFRP), the elastic modulus is 210GPa, and the thermal deformation is only 1 / 4 of that of steel. The workpiece clamp adopts vacuum suction + mechanical composite clamping, the vacuum channel diameter is 0.3mm, and the distribution density is 16 / cm 2 , which can generate a uniform suction force of 0.15MPa. In terms of feature matching, the rolling body of the sliding block and the guide rail adopts a G10-grade ceramic ball with a diameter of 3.175mm, and the roundness error is less than or equal to 0.1μm. In terms of position accuracy, the flatness of the bearing plate 31 is 0.01mm / m, and the position repeatability is ±0.003mm under the temperature fluctuation of ±5℃. The structure can control the clamping deformation of the thin-walled gold piece (thickness 0.2mm) within 2μm, and meets the jewelry-level processing requirements.

[0070] In a specific embodiment, the one-way sliding block 28 is any structure of steel, aluminum or copper.

[0071] Further, the material selection of the one-way slider 28 forms a differentiated performance matrix. The steel solution (42CrMo) is surface-hardened to HV1100 after nitriding treatment, suitable for heavy-duty machining with cutting force > 500N, but the mass increases by 30%. The aluminum solution (AlSi10Mg) is formed by selective laser melting (SLM), and the internal honeycomb structure (pore diameter 0.5mm) makes the mass reduce by 40%, while maintaining the bending strength of 400N / mm 2 The copper solution (C18150) adds 0.8% chromium to form a conductive network, with an electrostatic discharge rate < 0.1s, suitable for processing noble metal powders prone to static electricity. The matching relationship between material properties and guide rails is as follows: steel slider with rolling guide rail, rated dynamic load up to 15kN; aluminum slider with air static pressure guide rail, moving mass only 1.2kg; copper slider suitable for magnetic levitation guide rail, no contact wear. Experimental data shows that the temperature rise of the three solutions after 8 hours of continuous work is 22℃, 15℃ and 18℃ respectively, and the corresponding positioning drift is 1.2μm, 0.8μm and 1.0μm. Users can choose flexibly according to the processing needs.

[0072] In a specific embodiment, the outer circumferential surface of the first guide rail 4 and the second guide rail 5 is coated with a wear-resistant layer.

[0073] Further, the composite design of the wear-resistant layer realizes a breakthrough in the service life of the guide rail. The base is made of GCr15 bearing steel, and after deep cryogenic treatment (-196℃×24h), the residual austenite is <3%. The wear-resistant layer is a multi-layer structure: the bottom layer is a 0.1mm thick chemical nickel-phosphorus (Ni-P) alloy with a hardness of HV650; the middle layer is a 0.05mm thick diamond-like carbon (DLC) film with a friction coefficient of 0.05; the surface layer is a solid lubricant containing MoS2 with a wear rate of <1×10 -7 mm 3 / N·m. Characteristic matching, the profile accuracy of the guide rail sliding surface is 0.003mm, and the matching gap of the slider is dynamically adjusted by a laser range finder (0-50℃ range, 0.01±0.002mm). Position holding test shows that after 500km of cumulative running, the straightness attenuation of the guide rail is only 0.002mm / 100mm, which is 10 times longer than the service life of the traditional chrome-plated guide rail. This technology enables the equipment to maintain a positioning accuracy of ±0.005mm in a coastal environment with 80% humidity, especially suitable for harsh working conditions in noble metal processing workshops.

[0074] Therefore, the noble metal surface engraving machine 12 of the present application realizes multi-directional high-precision cooperative movement of the workpiece and the engraving machine 12 through the unique design of the L-shaped carrier 1, combined with the bidirectional translation assembly 8 and the double-screw rod adjusting mechanism, effectively solving the problems of structural redundancy, insufficient rigidity and error accumulation in the prior art.

[0075] The above-described embodiments are merely illustrative of several embodiments of the present application, which are described in more detail and in a more specific and detailed manner, but should not be construed as limiting the scope of the patent application. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A noble metal surface engraving apparatus characterized by comprising: The application relates to an L-shaped carrier, a first adjusting mechanism, a second adjusting mechanism and a carving machine. The L-shaped carrier comprises a first installation plane and a second installation plane arranged perpendicularly to each other, a first guide rail arranged on the first installation plane and extending in a first horizontal direction, and a second guide rail arranged on the second installation plane and extending in a second horizontal direction perpendicular to the first horizontal direction. The first adjusting mechanism comprises a first screw rod assembly arranged parallel to the first guide rail and a bidirectional translation assembly slidably mounted on the first guide rail and in transmission connection with the first screw rod assembly. The second adjusting mechanism comprises a second screw rod assembly arranged parallel to the second guide rail and a bearing assembly slidably mounted on the second guide rail and in transmission connection with the second screw rod assembly, and the bearing assembly is used for loading workpieces. The carving machine is fixedly mounted on the bidirectional translation assembly.

2. A precious metal surface engraving apparatus according to claim 1, wherein The L-shaped carrier comprises a first motor and a second motor arranged on the outer circumferential surface thereof, the output end of the first motor is fixed to the first screw rod assembly, and the output end of the second motor is fixed to the second screw rod assembly.

3. The precious metal surface engraving apparatus of claim 1, wherein The first screw rod assembly comprises: first bearing seats fixedly mounted on both ends of the first installation plane, a first rod body which is a ball screw rod and is rotatably mounted in the first bearing seats through bearings, and a first nut seat sleeved on the first rod body and fixedly connected with the bidirectional translation assembly.

4. A precious metal surface engraving apparatus as claimed in claim 3, wherein The bidirectional translation assembly comprises: a bidirectional sliding block provided with a first sliding groove matched with the first guide rail at the bottom and in threaded connection with the first rod body through the first nut seat, and a workbench slidably mounted on the top of the bidirectional sliding block through a third screw rod assembly, and the extension direction of the third screw rod assembly is parallel to the first installation plane.

5. A precious metal surface engraving apparatus as claimed in claim 4, wherein The two end faces of the bidirectional sliding block in the direction perpendicular to the first installation plane are sequentially provided with a first sliding groove and a second sliding groove, the first sliding groove is in sliding fit with the sliding block of the third screw rod assembly, and the second sliding groove is in sliding fit with the limiting protrusion of the workbench.

6. A precious metal surface engraving apparatus as claimed in claim 4, wherein The bidirectional translation assembly further comprises a third screw rod assembly, and the third screw rod assembly comprises: a third motor fixedly mounted on one side of the bidirectional sliding block, a third rod body which is a ball screw rod and coaxially connected with the output shaft of the third motor at one end, and a third nut seat sleeved on the third rod body and fixedly connected with the workbench.

7. A precious metal surface engraving apparatus as claimed in claim 6, wherein The workbench is formed with a supporting portion in the direction perpendicular to the second installation plane, the working end of the carving machine penetrates through the supporting portion to process workpieces, and the supporting portion is in clamping connection with the carving machine.

8. The precious metal surface engraving apparatus of claim 1, wherein, The bearing assembly comprises: a unidirectional sliding block provided with a second sliding groove matched with the second guide rail at the bottom and in threaded connection with the screw rod of the second screw rod assembly through a second nut seat, and a bearing plate fixedly mounted on the top of the unidirectional sliding block and provided with a workpiece clamp on the surface thereof.

9. A precious metal surface engraving apparatus as claimed in claim 8, wherein, The unidirectional sliding block is any structure of steel, aluminum or copper.

10. The precious metal surface engraving apparatus of claim 1, wherein, The outer circumferential surfaces of the first guide rail and the second guide rail are coated with an anti-wear layer.

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